/Engine/Plugins/FX/Niagara/Source/NiagaraEditor/Public/ViewModels/HierarchyEditor/NiagaraUserParametersHierarchyViewModel.h
This function determines whether a hierarchy item that represents that external data should be maintained during data refresh Needs to be implemented if RepresentsExternalData return true. The context object can be used to add arbitrary data.
virtual bool DoesExternalDataStillExist ( const [UNiagaraHierarchyDataRefreshContext](API\Plugins\NiagaraEditor\ViewModels\HierarchyEditor\UNiagaraHierarch-_1) * Context ) const